[Closed] tubeless explained

Personally don't believe in really low pressure. Proper ust tyres are a lot stiffer than a normal tyre.
Main advantage is more puncture resistance, but you can still puncture them..

this exact same tyre was completely softer with a tube. Hans dampf tubeless ready

I can't say I have ever experienced the phenomenon you describe, and to be honest it doesn't make any sense.

What on earth are you on about pitchpro?

The accuracy of the human body as a calibrated measuring device never ceases to amaze me.

ok I haven't converted my front tyre to tubeless yet so I'll let it down to 25psi and take a picture of the difference.

Many thanks for the 'clear' explanation!

OP you do know the only thing "special" about "tubeless ready" is a slightly thicker rubber around the bead to aid sealing.

Well, that's tubeless cleared up.

NEXT!

The accuracy of the human body as a calibrated measuring device never ceases to amaze me.

😀

[i]Almost[/i] made me chuckle, but not quite... Elicited a genuine wry smile though! 😉

35 PSI in a larger volume will feel a lot harder - see your cars tyres.

I fancy a share of all this derision, so I'll admit to having noticed this phenomenon too. Nothing to do with the type of tyre, purely a difference between the 'thumb feel' of a tyre when run at a similar pressure with and without a tube.

Not sure it 'explains' tubeless though.

Less boingy more squidgable and at least 13.4% squirmirisation.It's pretty obvious to anyone.

35 PSI in a larger volume will feel a lot harder - see your cars tyres.

Think you might find thats more to do with the car tyre being a 4 ply and a bike tyre not. 😉

Think you might find thats more to do with the car tyre being a 4 ply and a bike tyre not.

Mebbe but IMO the OP is right in that the exact same tyre feels significantly harder tubeless at the same PSI. What's your explanation for that? I asked about this ages ago:

http://singletrackworld.com/forum/topic/you-know-when-people-talk-about-psi-numpty-physics-question

What's your explanation for that?

I don't have an explanation for something that i've never experienced myself.

I have noticed how much better a tyre feels when ridden tubeless though.
How it feels to the touch of my hand is irrelavent. 🙂

the guys i ride with who run low pressures before didnt notice. i ride high pressures normally and certainly notice. i wouldnt even dream of riding 25psi before. always some smart ass ready to scoff at a comment. i eat a steak not poke it but i sure as hell poke it to check its done.

Tubeless explained.......

Tubeless, no inner tube .

None tubeless, has an inner tube.

Hi
Pitchpro2011, friends you ride with???? Either your being completly honest or your friends have the patience of saints because you must bore them sensless with all your mindless dribble?!?!?!

Have you ever heard such cr$p come from one person and what's all this about poking a steak!!!!!!

It's been entertaining that I agree.

Sorry *Either your "NOT" being completly honest

used to run 40-45 on rear.

is this your road bike?

I run the same pressures as when I ran tubes (35 rear, 28 front), but there's definitely more grip. Never been interested in that low pressure thing, don't like the "squirming on the rim" feel.

pitchpro2011 - Member

in short low pressure in a tubesless tyre is at least as firm as 10psi more with tubes.most here will already know this

Nope.

I've noticed the same phenomenon using the same tyres - just converted to tubeless - to get the same amount of squish (eg similar contact patch size) when riding, I dropped from 40psi to about 20-25.

My idea (and I haven't really spent the time thinking it through in great enough detail to say that it's the right answer):

An innertube is elastic and when pumped up inside a tyre, is stretched. As such you have a certain amount of pressure in the tube just to get it to fill the tyre.

You don't have that with tubeless - the air always acts directly on the tyre and isn't being compressed by anything (until you sit on the bike)

So, however much pressure it takes inside the tube to get it to expand to fill the tyre is the difference.

Maybe 🙂

Your squeezing a different tyre.

Its different because its made differently, you know, to hold the air in without a tube.

So of course it "feels" different. Its probably got a thicker sidewall, probably because it has to be air proof.

I've noticed the same phenomenon [b]using the same tyres[/b] - just converted to tubeless

You spent money on it, of course it feel better 🙂

Or can someone provide some science ?

I tried to above. I'm waiting for someone more bothered than me to say whether it's actually right 😀

(FWIW, I don't think tubeless feels better. I just don't get pinch flats and punctures seal themselves)

clubbers explination sounds plausible - but...

it definately doesnt take 15-20 PSI to expand a tube to the shape of a tyre which is the difference we're talking about (unless your using a racing bike tube!)

and

even if it did take say 15psi to just touch the outer wall of the tyre - if you push your thumb into the tyre you would still feel 15 psi worth of resistance from the tube(Not 0 PSI as would be required for this to explanation to be correct).

next....

Yeah, I did realise that was a flaw but it's the only explanation I could be bothered to come up with 😉

Without the tube you are pressurising a slightly greater volume. The tubeless setup should therefore feel slightly [u]softer[/u] at a given pressure, but you must have had your thumb recently calibrated to pick up on this.

what about all the sealant - that takes up volume.

That makes no sense, you let the tyre down until it "felt" right?

[img] [/img]

A tyre (well more specifically the air in it) is basically a spring.

By taking out the tube and running tubeless you are removing resistance (rubber) from the spring so it will feel plusher for a given spring rate (pressure)

in case you haven't noticed the clowns giving me shit are the guys I ride with. clearly alot of people notice this ,however, they always dismiss my opinion as nonsense despite having a combined iq of 50. 😉

I just bought a ceramic and titanium headset.... which they scoff at even though the expensive shit bearings they just bought broke within 2 weeks.
much love you tossers xxx

This thread desperately needs someone with a full grasp of physics.

I am not that man. However, I am a man who says tubeless is rubbish and a faff.

simple really when you think about It.....take 2 things exactly the same but in extreme to highlight...... a brick and a flat piece of wood weighing exactly the same. The wood even though being the same weight and force will offer more resistance from sinking in a swimming pool because the surface area is greater....the volume is greater. in the tubeless tyre there is a larger surface of air pressing against a flat surface.

However, I am a man who [s]says tubeless is rubbish and a faff.[/s] doesn't have a big enough track pump or a bottle of Fairy.

😛

So, can anyone explain| did this retard fill his tyre with bricks or wood?

Hans Dampfs are nice?

Sighs at lack of elementry physics, wood is generally less dense than bricks that's why it floats, some woods do not float.

When something like a log of wood is put into water, it pushes down on the water and the water moves aside to make room for the object. When there is enough water to push back up against the object with the same force as the object is pushing down, then the object will float!

That’s why a piece of wood that is lightweight for its size will float in a big body of water, like the ocean or a river. However, that same piece of wood might not float in a different smaller body of water.

How much pressure does it take to inflate an inertube to the size of a tyre? 10 psi or so.......

......but that's elastic deformation.